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Manager
Joined: 02 Jun 2005
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10 Jul 2005, 12:11
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Unlike the use of headset telephones, which allow drivers to keep their hands on the wheel, all drivers are prohibited from using portable phones while driving.
A.Unlike the use of headset telephones, which allow drivers to keep their hands on the wheel
B.Besides using headset telephones, which allow drivers to keep their hands on the wheel
C.Unless headset telephones, which allow drivers to keep their hands on the wheel, are used
D.Other than the use of headset telephones, which allows drivers to keep their hands on the wheel
E.Aside from using headset telephones which allow drivers to keep their hands on the wheel

OA will follow.
If you have any questions
you can ask an expert
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Director
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10 Jul 2005, 12:55
I will go with C
Director
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10 Jul 2005, 13:04
C is fine.

Rest all are ugly.

Wrong comparison in A and D
E has the concept all wrong. Non restrictive clause has been made restrictive and the meaning is different.

B, besides is unable to make a comparison or contrast.
Senior Manager
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11 Jul 2005, 01:26
I'll pick D
Senior Manager
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11 Jul 2005, 05:05
I was trying to choose between B and C, but B seems to be more awkward. My choice is C
SVP
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11 Jul 2005, 06:37
i pick C..
Manager
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11 Jul 2005, 07:24
tinyseal wrote:
C.Unless headset telephones, which allow drivers to keep their hands on the wheel, are used

OA is indeed C.

I thought "which" clause can only modify a singular noun. Only "that" clause can modify plural noun. However, this case does not follow the rule.

Can anyone explain the usage of "which" clause vs "that" clause?
CEO
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02 Sep 2007, 14:19
tinyseal wrote:
tinyseal wrote:
C.Unless headset telephones, which allow drivers to keep their hands on the wheel, are used

OA is indeed C.

I thought "which" clause can only modify a singular noun. Only "that" clause can modify plural noun. However, this case does not follow the rule.

Can anyone explain the usage of "which" clause vs "that" clause?

which is modifying the gerund phrase, which acts as a noun.

Using headset telephones is fun.
Noun / Gerund phrase + is fun.
Manager
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02 Sep 2007, 14:38
I will pick C

which is used to provide "extra" information.
That is used to provide information which is essential for a sentence
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22 May 2010, 05:38
C. Not the best written sentence, but the best among the choices.
A, B, D and E make a wrong comparison between 'telephones' and 'drivers'.
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22 Jan 2011, 08:39
C is the best
Senior Manager
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27 Jan 2011, 14:30
C is ugly!
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16 Feb 2017, 22:57
1
KUDOS
This question is very similar to

Quote:
Unlike transplants between identical twins, whose genetic endowment is the same, all patients receiving hearts or other organs must take anti-rejection drugs for the rest of their lives.

(A) Unlike transplants between identical twins, whose genetic endowment is the same
(B) Besides transplants involving identical twins with the same genetic endowment
(C) Unless the transplant involves identical twins who have the same genetic endowment
(D) Aside from a transplant between identical twins with the same genetic endowment
(E) Other than transplants between identical twins, whose genetic endowment is the same

Notice the pattern in these - the questions want you to think you're deciding between "unlike", "besides", "not like", etc. But the key to C in each of these choices is that the other answer choices are all modifiers:

-Unlike water, all passengers
-Aside from a transplant, all patients
-Other than the use of headset telephones, all drivers

And none of those modifiers is logical. The subject of each sentence is a type of person (drivers, passengers, patients) but the modifier describes objects.

In each of these, choice C changes the game - it's not a modifier. Each answer choice C provides an "unless X is true, Y is true" setup in which the underlined portion contains its own subject and verb. So "unless headset telephones ARE USED, all drivers are prohibited..." isn't a modifier-subject-verb, it's two related clauses. That's the difference in these.

Note two other things:

1) Each one tries to get you to decide between synonyms (unlike, besides, not like) - which should indicate to you that you have to find a better decision point. We simply won't become experts on the nuances (if, indeed, any exist) between those extremely-similar terms.

2) Each also involves a modifier-within-a-modifier (the interior modifier starting with "which"). If you note that "which" in each case does properly modify the word before it, you can read as though that modifier isn't even there. Modifiers on the GMAT have two roles - they're either decision points based on which you can eliminate the whole answer (because it's an illogical modifier) or they're just there to make you read more words in your pursuit of another decision point. If you don't use a comma-separated modifier to eliminate a sentence, then try ignoring it to make a shorter sentence.

Explanation Courtesy Brian from Veritas Prep
Re: headset telephones   [#permalink] 16 Feb 2017, 22:57
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